Travel as far through the underground cavern as you can. Your submarine is agile and powerful, but youll need nerves of steel and the reactions of a fox to guide the machine between the perilous rock formations to achieve a record distance.
Touch and hold the screen to make the submarine dive downwards, let go to immediately rise higher.
Go as far as you possibly can, then compare your score with your friends. Put your best on Twitter or Facebook and see if your friends can do any better.